Davis, L. S. (2007). Smithsonian Q&A: The ultimate question and answer book. Collins.
Cita Chicago Style (17a ed.)Davis, Lloyd Spencer. Smithsonian Q&A: The Ultimate Question and Answer Book. New York: Collins, 2007.
Cita MLA (8a ed.)Davis, Lloyd Spencer. Smithsonian Q&A: The Ultimate Question and Answer Book. Collins, 2007.
Precaución: Estas citas no son 100% exactas.